Frank c



(No Model.)

F. 0. SMITH.

AIR REGULATOR FOR FURNACES. No. 366,088. Patented July 5, 1887.

WITNESSES: AINVENTOR:

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UNITED STATES PATENT Erica.

FRANK OQSMITH, OF DELAWARE, OHIO.

AIR-REGULATOR FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 366,038, dated July 5, 1887.

Application filed February 25, 1887. Serial No. 228,875. (No model.)

To all whom may concern..-

Be it known that L'FRANK 0. SMITH, of

Delaware, in the county of Delaware and State of Ohio, have invented a new and Improved Air-Regulator for Furnaces, of which the fol- -lowing is a specification, reference being had a locomotiveboiler, showing the fire-door and the cold-air damper; and Fig. 2 is a plan view, partly in section, of the same. I

Similar letters of reference indicate correspending parts in both views.

It is a common practice in firing locomotive and other boilers to admit air to the furnace above the fire, to supply to the gases the oxygen necessary to insure their combustion, and when the heavy gases and smoke are consumed the cold-air dampers are commonly left open, and the admission of air after the combustion of the gases, resulting from the contact of the fresh coals with the ignited coals, is detrimental, as it tends not only to deaden the fire, but to cool down theboiler.

- The object of my invention is to obviate these difficulties by providing an automatic cold-air-damper regulator, which will be operated whenever'thc firedoor of the boiler is opened, and which will effect the closing of the cold-air damper within a prescribed time from the opening ofthe damper.

My invention consists in the combination, with the cold-air damper and fire-doorof a furnace, of a springarranged to close the airdamper and a cataract or dash-pot adapted to bolcr, is pivoted a right-angled lever, D, having the arm 6 connected to the cold-air damper O by the link f. The arm g of the said lever is provided with a slot, h.

In a convenient position at the front of the boiler is supported a cataract, E, consisting of the cylinder 13, containing the piston j, provided with series of apertures k, and having on its upper surface an apertured valve, Z, which is adapted to close the openingsJc of the piston. The piston j is secured to :a pistonrod, m, which passes through apertures at opposite ends of the cylinder. The upperend of the piston-rod m is provided with a head, a, between which and the top of the cylinder is placed a spiral spring, 0. A pipe, 1), communicates with opposite ends of the cylinder, and is provided with a plug-valve, q, by which it may be closed more or less. The lower end of the rod m is provided with a stud, r, which passes through the sloth of the lever D.

Upon a stud, F, projecting from the front of the boiler, is pivoted a right-angled lever, G, providedwith an arm, 8, having a slot, t, and a straight upwardly-projecting arm, a, which is held in the path of a lug, 1), projecting from the face of the door. A stud, w, extends from the rod at through the slot 15 of the right-angled lever G. Vhen the firedoor B is opened, the lug o is brought into engagement with the arm a of the lever G, and turns the said lever on its pivot, imparting a downward motion to the rod m, carrying the piston j downward in the cylinder, forcing the oil or other liquid contained by the cylinder from the space below the piston to the space above the piston through the apertures. 76 of the pis ton and through the apertured valve Z, at the same time compressing the spring 0 at thetop of the cylinder. The engagement of the stud r, projecting from the lower end of the rod m,

with the lever D slides the damper- 0 so as to cause the apertures 0 to coincide with the apertures b, and thus admit boilerfurnace above the fire. Tifliemthe door B is closed, the levcr G beiug released, the spring 0 tends to raise the piston 3'; but the upward movement of the piston is retarded by the oil, which can escape from the space above the piston to the space below the piston only through the pipe 19 and valve q. The valve q is adjusted so as to insure the slow transfer of the liquid from the upper to the lower end of the cylinder, the movement of the piston being regulated by the valve q, so that the piston will return to the point of starting in about-- the time required to consume the smoke re sulting from the newly-added coal.-

In lieu of the spring 0 at the top of the cataract, I may employ a steam or air cylinder to secure the desired action.

I have described one form of my apparatus;

5 but I do not limit or confine my improvement to this particular form, as it may be varied to adapt it to boilers and furnaces of various kinds.

Having thus fully described my invention,

IoI claim as new and desire to secure by Letters Patent 1. .In an air-regulator for furnaces, the combination, with the fire-door and cold-air damper, of a damper opener and closer, and a I 5 retarding device arranged to cause the damper to close slowly, substantially as described.

2. In an air-regulator for furnaces, the combination, with the cold-air damper, of a valveclosing spring, a cataract for retarding the ac- 20 tion of the spring, and means, substantially as described, for opening the damper.

.closing spring 0, and connections intermediate between the rod m, fire-door B, and damper O, substantially as described.

4. In an air-regulator for boiler-furnaces, the combination, with the fire-door B and damper O, of the lever G, adapted to receive motion from the fire-door, the rod m, connected with-the said lever G, the liquid-filled cylinder 6, provided with the pipep and valve 35 q, the spring 0, and the lever D, connected with the damper Oand rod m, substantially as described.

FRANK 0. SMITH.

\Vitnesses:

M. E. BoBnrs, L. B. SMITH. 

